Just a last question, I do not remember if I have even do it. Would you know how to integrate news provided by news manager in sitemap.xml for google and others search engine indexation ?

See you.

I guess I haven't helped you much but still you're welcome.

I would also be very interested in the second point. As for now - I'm adding every post I write into the Google index via my account in the developer tools. If you don't have an account for your website, you can add your site (or concrete page) to the Google index using the form in this link.